# [Eeglablist] Question about ERSP statistics

Lianyang Li lli26 at uh.edu
Wed Oct 7 15:52:36 PDT 2015

```Hi Makoto

I am pretty sure that my preprocessing is correct. Actually, my problem is
the same as Alice's.
Hope you can solve this problem soon.

Thanks

On Wed, Oct 7, 2015 at 5:38 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
wrote:

> Dear Lianyang,
>
> If I understand it correctly it's a subtraction after dB conversion, so
> it's a division, but anyway yes 'subtract baseline' I mean is that.
>
> Makoto
>
>
> On Wed, Oct 7, 2015 at 3:35 PM, Lianyang Li <lli26 at uh.edu> wrote:
>
>> Hi Makoto
>>
>> "subtract baseline".
>> Before computing ERSP, I have removed the baseline of each trial of each
>> subject with prestimulus, e.g [-200 0]. Is that what you said?
>> Or should I remove the baseline with the whole range or remove baseline
>> of ERSP results?
>>
>> Thanks
>> Lianyang
>>
>> On Tue, Oct 6, 2015 at 12:12 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
>> wrote:
>>
>>> Dear Lianyang,
>>>
>>> My initial guess: in the 2.png you did not subtract baseline, did you?
>>>
>>> Makoto
>>>
>>> On Fri, Sep 25, 2015 at 3:44 PM, Lianyang Li <lli26 at uh.edu> wrote:
>>>
>>>> Hi Dear all
>>>>
>>>> I came across some problems when I was do the ERSP statistics with
>>>> single trials.
>>>> I have 2 groups of data(mTBI and normal), both have four
>>>> conditions(1,3,5,7). After pre-computing the ERSP and save the single trial
>>>> information, I tried to get some statistics results based on that.
>>>> The parameters are shown in the Figure 1.
>>>> The results using single trials are shown in the Figure 2.
>>>> The results without single trials are shown in the Figure 3.
>>>> My question is the scale in Figure 2 seems to be too much larger than
>>>> that of Figure 3. I cannot understand these difference and hardly find some
>>>>
>>>> Thanks
>>>> Lianyang
>>>>
>>>> --
>>>>
>>>> U
>>>>   H
>>>>
>>>> UNIVERSITY *of * HOUSTON
>>>>
>>>>
>>>> Engineering Technology, Computer Science,
>>>> Electrical and Computer Engineering
>>>>
>>>>
>>>>
>>>> *Lianyang Li , Graduate Student. Research AssistantBiomedical Imaging
>>>> Lab*
>>>>
>>>> Philip G. Hoffman Hall   •   Houston, TX 77204-3058   •   Room 233
>>>> Phone: *832-607-6588 <832-607-6588>*  E-mail: *lli26 at uh.edu
>>>> <lli26 at uh.edu>*  Web: *http://www.tearsmorethansaid.com/
>>>> <http://www.tearsmorethansaid.com/>*
>>>>
>>>>
>>>>
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>>>
>>>
>>>
>>> --
>>> Makoto Miyakoshi
>>> Swartz Center for Computational Neuroscience
>>> Institute for Neural Computation, University of California San Diego
>>>
>>
>>
>>
>> --
>>
>> U
>>   H
>>
>> UNIVERSITY *of * HOUSTON
>>
>>
>> Engineering Technology, Computer Science,
>> Electrical and Computer Engineering
>>
>>
>>
>> *Lianyang Li , Graduate Student. Research AssistantBiomedical Imaging Lab*
>>
>> Philip G. Hoffman Hall   •   Houston, TX 77204-3058   •   Room 233
>> Phone: *832-607-6588 <832-607-6588>*  E-mail: *lli26 at uh.edu
>> <lli26 at uh.edu>*  Web: *http://www.tearsmorethansaid.com/
>> <http://www.tearsmorethansaid.com/>*
>>
>>
>>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>

--

U
H

UNIVERSITY *of * HOUSTON

Engineering Technology, Computer Science,
Electrical and Computer Engineering

*Lianyang Li , Graduate Student. Research AssistantBiomedical Imaging Lab*

Philip G. Hoffman Hall   •   Houston, TX 77204-3058   •   Room 233
Phone: *832-607-6588*  E-mail: *lli26 at uh.edu <lli26 at uh.edu>*  Web:
*http://www.tearsmorethansaid.com/
<http://www.tearsmorethansaid.com/>*
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